US10194122B2 - Method for controlling projector and projector applicable to same - Google Patents

Method for controlling projector and projector applicable to same Download PDF

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Publication number
US10194122B2
US10194122B2 US15/740,244 US201615740244A US10194122B2 US 10194122 B2 US10194122 B2 US 10194122B2 US 201615740244 A US201615740244 A US 201615740244A US 10194122 B2 US10194122 B2 US 10194122B2
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projector
image
rgb
current environment
output image
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US20180192012A1 (en
Inventor
Jinteng TANG
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Yutou Technology Hangzhou Co Ltd
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Yutou Technology Hangzhou Co Ltd
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Assigned to YUTOU TECHNOLOGY (HANGZHOU) CO., LTD. reassignment YUTOU TECHNOLOGY (HANGZHOU) CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANG, JINTENG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3191—Testing thereof
    • H04N9/3194—Testing thereof including sensor feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control

Definitions

  • the present invention relates to the technical field of projector devices, and in particular, to a method for controlling a projector and a projector applicable to the method.
  • the projectors are mainly realized by three kinds of display technologies, that is, the CRT projection technology, the LCD projection technology and the DLP projection technology developed in recent years.
  • CRT is an English abbreviation of Cathode Ray Tube, translated as cathode ray tube.
  • This projector can be decomposed into the input signal source R (red), G (green) B (blue) three CRT tube screen, and the phosphor lights under the action of high pressure, systematically magnified, convergent, showing a color image on the big screen.
  • the optical system and CRT tube form a projection tube.
  • the so-called three gun projector is composed of a projector comprising three projection tubes, due to the use of light source, also known as active projection.
  • CRT technology is mature, so the images displayed are rich in color, good in reducibility with the ability for adjusting geometric distortion.
  • LCD is an English abbreviation of Liquid Crystal Device.
  • LCD projector is divided into two kinds as liquid crystal board and liquid crystal light valve.
  • Liquid crystal is a substance between liquid and solid. It does not shine, and the working nature is greatly influenced by temperature, and its working temperature is ⁇ 55 C ⁇ +77 C.
  • the projector utilizes the photoelectric effect of the liquid crystal, that is, the arrangement of the liquid crystal molecules changes under the influence of the electric field, affecting the light transmittance or reflectivity of the liquid crystal cell, thereby affecting its optical nature, resulting in images with different gray levels and colors.
  • DLP is an English abbreviation of Digital Light Processor, translated as digital light processor.
  • the birth of this new projection technology enabled us to finally realize digital information display with the ability to capture, receive and store digital information.
  • DLP technology is an epoch-making revolution in the field of display. Just as CDs have a huge impact on audio, DLP will open a new chapter in video projection display.
  • the key technical points of its DLP projector with DMD (Digital Micromirror Device) digital microreflector as a light valve imaging device are as follows: the first is the digital advantage.
  • the use of digital technology has achieved the image grayscale of 256-1024 level, the color of 2563-10243 kinds, the disappearance of the image noise, the stability of the picture quality, wherein accurate digital images can be reproduced continuously, and lasting.
  • the second is the reflection advantage.
  • the application of the reflective DMD device makes the total optical efficiency of the imaging device more than 60%, and the uniformity of contrast and brightness is excellent.
  • the area of each pixel is 16 ⁇ m*16 ⁇ m, and the interval is 1 ⁇ m.
  • the DLP projector can be divided into single chip, two chips and three chips machine.
  • DLP projector has high definition, uniform picture, sharp color, and three chips machine can be more than 1000 lm in brightness. It abandoned the traditional sense of convergence, which can be free to zoom, and the adjustment is very convenient; however, the resolution is not high, with uncompressed resolution of 800 ⁇ 600 (some models of the latest product resolution has reached 1280 ⁇ 1024). However, due to the new technology, the difficulty and cost of maintenance are not low.
  • the projector first shines light onto the image display element to produce an image, which is then projected through the lens.
  • the image display element of the projector includes a transmission type that generates an image by light transmission and a reflection type that generates an image by using the reflection light. No matter what kind of type, it is necessary to divide the light of the projection lamp into red, green and blue colors to produce various color images. Because the element itself can only be monochrome display, it is necessary to use three-color elements to generate three-color parts. And then the three-color images are combined into one image through the prism, and finally projected onto the screen through the lens.
  • DLP projectors In the case of DLP projectors, projectors need to project their images onto a white screen to maximize the projected image quality.
  • the screen is not white, such as the screen is yellow, red, green, or the surrounding environment is yellow, red and other interference
  • the projected image quality is affected by screen color or ambient light color, resulting in image distortion.
  • the reason for the image distortion is that the projector does not have the function of automatic white balance based on screen color or ambient light color. Projector just projected the original image as realistic as possible. There is no adaptive self-adjusting capability for different color screens or different color ambient light.
  • the present application provides a method for controlling a projector, comprising the steps of:
  • the step S 3 comprises the steps of:
  • the present invention also provides a projector, which is applicable to the method for controlling the projector, comprising a projector body for projecting on a screen, wherein, further comprising a sensing module located on the projector body for obtaining the output image or the current environment image; and a control device configured to process the output image or the current environment image, so as to obtain the gain coefficients of three channels RGB in the projector after calculation and adjust the gains of the three channels RGB according to the gain coefficients.
  • a projector which is applicable to the method for controlling the projector, comprising a projector body for projecting on a screen, wherein, further comprising a sensing module located on the projector body for obtaining the output image or the current environment image; and a control device configured to process the output image or the current environment image, so as to obtain the gain coefficients of three channels RGB in the projector after calculation and adjust the gains of the three channels RGB according to the gain coefficients.
  • the control device comprises: a reading unit configured to obtain the RGB component of the output image or the current environment image; a counting unit for counting each average value of the RGB components, as Rave, Gave, Bave; a calculating unit for calculating the grayscale value Gary of the output image or the current environment image; a coefficient obtaining unit for calculating the gain coefficients Kr, Kg, Kb of the three channels R, G, B according to each average value of the grayscale value Gary and the RGB component; an adjusting unit for adjusting the R, G, B gains of each pixel in the projection image according to the gain coefficients Kr, Kg, Kb of the three channels.
  • the sensing module is an RGB light sensor.
  • the sensing module is an RGB light sensing matrix.
  • the sensing module is a camera.
  • the direction of the sensing module is the same as the projection direction of the projector body.
  • the present patent application describes a method for controlling a projector and a projector applicable to the method.
  • the gain effect is as follows: if the sensing module collects the output image, the projector can make the projection screen no longer limited by the color. That is, with the projector, the screen of various colors can be freely selected and the influence of the projection will not be affected; if the sensing module collects the current environment image, the present invention can also remove the influence of the color temperature of ambient light on the projection effect.
  • FIG. 1 is a flowchart 1 of a method for controlling a projector of the present invention
  • FIG. 2 is a flowchart 2 of a method for controlling a projector of the present invention
  • FIG. 3 is a structural view 1 of a projector of the present invention.
  • FIG. 4 is a structural view 2 of a projector of the present invention.
  • “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated.
  • the term “plurality” means a number greater than one.
  • a method for controlling a projector comprising the steps of:
  • step S 3 comprises the steps of:
  • the sensing module 2 is operated to obtain an output image or a current environment image.
  • the output image or the current environment image is processed to obtain RGB components thereof, so as to calculate each average value Rave, Gave and Bave of the RGB components.
  • the gain coefficients Kr, Kg, Kb of the three channels R, G, B are calculated.
  • the R, G and B gains of each pixel in the projection image are adjusted according to the three gain coefficients to realize the automatic white balance of the projector.
  • the method for controlling a projector if the output image is captured in step S 2 , the method enables the projection screen no longer limited by the color, that is, the method can freely select the screens of various colors and the influence of the projection will not be affected. If the current environment image is captured in step S 2 , the present invention can also remove the influence of the color temperature of the ambient light on the projection effect.
  • a method for controlling a projector is provided, and this embodiment provides a projector applicable to the method.
  • the projector comprising: a projector body 1 for projecting a image on a screen; a sensing module 2 located on the projector body 1 for obtaining the output image or the current environment image; a control device 3 configured to process the output image or the current environment image, so as to obtain the gain coefficients of three channels RGB in the projector after calculation and adjust the gains of the three channels RGB according to the gain coefficients.
  • control module 3 comprising: a reading unit 31 for obtaining the RGB component of the output image or the current environment image; a counting unit 32 for counting each average value of the RGB components, as Rave, Gave, Bave; a calculating unit 33 for calculating the grayscale value Gary of the output image or the current environment image; a coefficient obtaining unit 34 for calculating the gain coefficients Kr, Kg, Kb of the three channels R, G, B according to each average value of the grayscale value Gary and the RGB component; an adjusting unit 35 for adjusting the R, G, B gains of each pixel in the projection image according to the gain coefficients Kr, Kg, Kb of the three channels.
  • the sensing module 2 is three RGB light sensors, which are simple, inexpensive, but less accurate.
  • the sensing module 2 may also be an RGB light sensing matrix, or may be a camera.
  • the accuracy of the latter two is higher than the former, the final gain effect will be better, but the cost is higher than the former.
  • the location of the sensing module 2 should also be different. When it is needed to achieve automatic white balance on the screen color, the sensing module 2 needs to obtain the output image, then the sensing module 2 needs to directly face the projection direction of the projector body 1 ; when it is needed to achieve automatic white balance on the ambient light, the sensing module 2 needs to obtain the current environment image, then the location and orientation of the sensing module 2 do not need to be strictly set.
  • the projector body 1 projects onto the screen, and the sensing module 2 collects the output image or the current environment image.
  • the reading unit 31 reads the RGB component of the captured image and transmits it to the counting unit 32 , after which the counting unit 32 counts the average values Rave, Gave, Bave of the RGB components.
  • the calculating unit 33 obtains the grayscale value Gary of the image collected by the sensing module 2 according to the three average values and transmits the average values Rave, Gave and Bave of the RGB components and the grayscale value Gary of the image to the coefficient acquiring unit 34 , so as to calculate the gain coefficients Kr, Kg, and Kb of the three channels R, G, and B.
  • the adjusting unit 35 adjusts the R, G, B gains of each pixel in the projection image according to Kr, Kg, Kb.
  • the projector can make the projection screen no longer limited by the color. That is, with the projector, the screen of various colors can be freely selected and the influence of the projection will not be affected; if the sensing module 2 collects the current environment image, the present invention can also remove the influence of the color temperature of ambient light on the projection effect. With the projector, the projection screen is no longer limited by the color. That is, the projector can freely select screens of various colors and the influence of the projection is not affected. In addition, the projector can also remove the influence of the color temperature of ambient light on the projection effect and greatly improve the projection effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Projection Apparatus (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Processing Of Color Television Signals (AREA)
US15/740,244 2015-06-30 2016-06-21 Method for controlling projector and projector applicable to same Active US10194122B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201510387028.XA CN106331664A (zh) 2015-06-30 2015-06-30 一种投影仪的控制方法及适用于该方法的投影仪
CN201510387028 2015-06-30
CN201510387028.X 2015-06-30
PCT/CN2016/086623 WO2017000812A1 (fr) 2015-06-30 2016-06-21 Procédé de commande de projecteur et projecteur pouvant être utilisé dans ce procédé

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US20180192012A1 US20180192012A1 (en) 2018-07-05
US10194122B2 true US10194122B2 (en) 2019-01-29

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US (1) US10194122B2 (fr)
EP (1) EP3319316A4 (fr)
JP (1) JP6623239B2 (fr)
CN (1) CN106331664A (fr)
HK (1) HK1231656A1 (fr)
TW (1) TWI599229B (fr)
WO (1) WO2017000812A1 (fr)

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CN106331664A (zh) 2015-06-30 2017-01-11 芋头科技（杭州）有限公司 一种投影仪的控制方法及适用于该方法的投影仪
CN109151416A (zh) * 2018-08-29 2019-01-04 中航国画（上海）激光显示科技有限公司 激光投影机多功能融合处理系统及方法
CN112004070A (zh) * 2020-06-29 2020-11-27 成都迅达光电有限公司 投影设备及其白平衡调整方法、以及可读存储介质
CN112738489B (zh) * 2020-12-23 2021-12-07 深圳市火乐科技发展有限公司 投影设备控制方法、装置、介质及电子设备
CN114549864A (zh) * 2021-12-31 2022-05-27 厦门阳光恩耐照明有限公司 一种基于环境图像的智能灯控制方法和控制系统

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TW201701657A (zh) 2017-01-01
US20180192012A1 (en) 2018-07-05
WO2017000812A1 (fr) 2017-01-05
JP6623239B2 (ja) 2019-12-18
HK1231656A1 (zh) 2017-12-22
TWI599229B (zh) 2017-09-11
EP3319316A1 (fr) 2018-05-09
CN106331664A (zh) 2017-01-11
EP3319316A4 (fr) 2019-03-13
JP2018527782A (ja) 2018-09-20

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